Why One Number Is Never Enough

1.1 — A stranger walks into the bakery with an offer

A man Meera has never met walks into Sunrise Bakery on a Tuesday morning. He says he wants to buy a fifth of the business. Fifteen lakh rupees, cash, for 20%.

Meera has no idea if that is a good offer or an insulting one. She knows one fact for certain: the bakery made ₹6 lakh last year. Is fifteen lakh for a fifth of it generous? She cannot tell from that number alone, and neither can you.

This is the problem every investor faces every day, just with more zeros. Somebody quotes you a number — a profit, a price, a percentage — and asks you to decide whether it is good. A bare number cannot answer that question. It needs something to stand next to.

1.2 — The trick nobody tells you: divide by something

Here's how Meera actually works it out. She doesn't stare at the ₹6 lakh. She divides it by something — by what she and Arjun originally put into the business. They started Sunrise with ₹6 lakh of their own savings. So last year's profit was 100% of that — the bakery earned back everything they put in, in a single year.

That single move — take the number, divide it by what it took to get there — is the whole trick behind every ratio in finance. A ratio is never a fact on its own. It's a comparison, dressed up as a number.

• ▹**Profit ÷ sales** asks: out of every rupee that comes in, how much survives to the bottom? That's called net margin.
• ▹**Profit ÷ what the owners put in** asks: what return did the owners actually earn on their own money? That's return on equity.
• ▹**Share price ÷ profit per share** asks: how many rupees am I paying for one rupee of yearly profit? That's the P/E ratio, and chapter 2 is entirely about it.

Notice something about all three: none of them tells you what to do. Each one just turns a raw number into something you can actually compare. The comparing is still your job.

1.3 — So what should Meera compare the offer against?

Back to the man with the cash. Meera can't just ask "is ₹15 lakh a fifth of the bakery a fair price?" and expect an answer to fall out of the sky. She needs to hold that number up against something. There are exactly three things she — or you — can compare against.

Compare it against the bakery's own past

The safest comparison there is, because it's the same business. Did profit grow steadily, or was last year a fluke? Reliance shows exactly why this matters.

Look only at the profit column and it's a growth story — up 21% in four years. Now look at the return column right next to it. Barely moved: 8.1% to 8.9%. That's not a contradiction. It means the pile of money Reliance is working with grew almost as fast as the profit did. A bigger profit on a bigger pile is a different achievement from a bigger profit on the same pile — and only the ratio tells you which one happened.

Compare it against the neighbours

If three other bakeries in Pune are also selling for around the same multiple of their profit, that tells Meera something real. Same idea with companies: businesses in the same industry face the same costs, the same customers, the same regulations — so a difference between them is more likely to be about the business, not the weather.

The trap here is assuming "same industry" means "comparable." It usually means less than you'd think — chapter 2 shows exactly how wide the gap can be between two companies sitting in the same sector.

Compare it against everyone

The third option is a straight percentile: not "is this big," but "where does this sit among every company we can measure." That's the approach behind the Health Score — no threshold to memorise, just a rank. Its trade-off is that it can flatten real differences between industries, which is why the sector rank sits right beside it.

1.4 — When there's no ratio to compute at all

Meera almost forgets to ask the obvious question: what if the bakery down the street, the one that closed last month, tried to sell a stake too? It couldn't. It was losing money, and you can't sensibly divide a price by a loss.

The same thing happens on the stock market constantly. A loss-making company has no meaningful P/E — dividing a price by negative earnings gives a number that means nothing next to a healthy company's P/E. You'll meet a peer group later in this module where three of seven companies have no P/E at all, for exactly this reason.

Where a ratio can't be computed honestly, this site shows a dash instead of a number. A dash is telling you something real. A made-up number would be telling you a lie dressed as data.

1.5 — What Meera actually does

She doesn't answer the stranger that morning. She says she'll think about it, and spends the evening doing exactly what this chapter just walked through: checking the bakery's own trend, asking around about what similar shops nearby have sold for, and being honest about the fact that a single year's profit tells her almost nothing on its own.

1. 1.**A ratio is a comparison, never a verdict.** It reshapes a question. It doesn't answer one.
2. 2.**Always be able to name what you're comparing against** — your own past, your peers, or the whole market. If you can't name it, you're really comparing against a rule of thumb you half-remember.
3. 3.**Watch the trend, not the snapshot.** One good year can be a fluke. Four years in the same direction rarely is.
4. 4.**A missing ratio is still information.** It usually means the arithmetic has nothing honest to say.

Chapter 2 picks up with the ratio everyone asks about first — the one printed next to every stock price you'll ever see — and it starts with a number that looks cheap and turns out to be a warning.